I have created this growing structure animation, I have turn on "Full Scene Reload" and Octane rendering this correctly but only to Mplay. When I want to render only to Disc - Octane is overiting one image file. I i`m left with only last frame of animation. How can I change it ?

You can scene file here and rendring settings.I hope that you will know solution.

Can you please replace the "." dot characters in the filename for "-" characters? I'm not sure why this filename is not expanded by Houdini at render time, but I'll investigate it. Perhaps the problem is related to the $HIP folder or the $HIPNAME file that have space characters or something like that.

Something like that as filename should work: $HIP/render/$HIPNAME-$OS-$F4, but you should try to don't use space characters in the folder or in the filenames.